[detect-newline] add typings (#18861)

types/detect-newline/detect-newline-tests.ts

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+import detectNewline = require('detect-newline');
+
+const res1 = detectNewline('foo\nbar\nbaz\r\n');
+res1; // $ExpectType "\r\n" | "\n" | null
+
+const res2 = detectNewline.graceful('foo\nbar\nbaz\r\n');
+res2; // $ExpectType "\r\n" | "\n"

types/detect-newline/index.d.ts

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+// Type definitions for detect-newline 2.1
+// Project: https://github.com/sindresorhus/detect-newline#readme
+// Definitions by: BendingBender <https://github.com/BendingBender>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+
+export = detectNewline;
+
+declare function detectNewline(str: string): '\r\n' | '\n' | null;
+
+declare namespace detectNewline {
+    function graceful(str: string): '\r\n' | '\n';
+}

types/detect-newline/tsconfig.json

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+{
+    "compilerOptions": {
+        "module": "commonjs",
+        "lib": [
+            "es6"
+        ],
+        "noImplicitAny": true,
+        "noImplicitThis": true,
+        "strictNullChecks": true,
+        "baseUrl": "../",
+        "typeRoots": [
+            "../"
+        ],
+        "types": [],
+        "noEmit": true,
+        "forceConsistentCasingInFileNames": true
+    },
+    "files": [
+        "index.d.ts",
+        "detect-newline-tests.ts"
+    ]
+}

types/detect-newline/tslint.json

@@ -0,0 +1 @@
+{ "extends": "dtslint/dt.json" }